Disclosed are methods and systems for water recovery. The method comprises, inter alia, providing a wastewater stream comprising one or more hydrophilic solutes and one or more crude-oil-associated hydrophobic solutes; extracting at least a portion of the wastewater stream with an extractant comprising an organic bi-directional solvent to form a water-depleted first aqueous solution and a water- enriched first organic phase; mixing the first organic phase with a hydrophobic solvent, to form a second organic phase and a displaced aqueous solution; and fractionating the second organic phase into a stream enriched in the bi-directional solvent and a stream enriched in the hydrophobic solvent.
C02F 1/26 - Treatment of water, waste water, or sewage by extraction
C02F 1/44 - Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
C02F 9/08 - Multistep treatment of water, waste water or sewage at least one step being a physical treatment
C02F 103/36 - Nature of the water, waste water, sewage or sludge to be treated from the chemical industry not provided for in groups from the manufacture of organic compounds
C02F 103/32 - Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
Disclosed are methods comprising: (a) first contacting at least a portion of a wastewater stream comprising one or more hydrophilic solutes and one or more crude-oil- associated hydrophobic solutes with an extractant comprising a bi-directional solvent at a first temperature (T1) within 40 ºC of the solvent-water critical temperature to form a water- depleted first aqueous solution and a water-enriched first organic phase; (b) adjusting the temperature of said first organic phase to a second temperature (T2), to form a second organic phase and a second aqueous solution; wherein the absolute value of (T2 – T1) is at least 20; (c) separating at least a portion of said one or more crude-oil-associated hydrophobic solutes from said second organic phase; and (d) recycling bi-directional solvent from said second organic phase to said first contacting. Disclosed are also systems.
C02F 1/26 - Treatment of water, waste water, or sewage by extraction
C02F 1/44 - Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
C02F 9/08 - Multistep treatment of water, waste water or sewage at least one step being a physical treatment
C02F 103/36 - Nature of the water, waste water, sewage or sludge to be treated from the chemical industry not provided for in groups from the manufacture of organic compounds
C02F 103/32 - Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
patents